Title: An integrated optimisation model of reservoir and irrigation system applying uniform deficit irrigation

Authors: Mohammad Ebrahim Banihabib; Ali Zahraei; Saeid Eslamian

Addresses: Department of Irrigation and Drainage Engineering, University College of Abureyhan, University of Tehran, P.O. Box 3391653755, Tehran, Iran ' Department of Irrigation and Drainage Engineering, University College of Abureyhan, University of Tehran, P.O. Box 3391653755, Tehran, Iran ' Department of Water Engineering, Collage of Agriculture, Isfahan University of Technology, Isfahan, 8415683111, Iran

Abstract: An optimisation model was derived for deficit irrigation to study four scenarios of water price-irrigation system combinations. The nonlinear objective function was optimised within a three-dimensional decision domain including: deficit irrigation ratios of wheat and tomato; and cropping area ratio of wheat to tomato. Four scenarios were employed regarding two pricing configurations including subsidised and non-subsided water prices and two irrigation systems as well. The results of the integrated optimisation model showed that the optimised deficit irrigation ratios are not changed by altering water price in each irrigation system. However, deficit irrigation of wheat crop increases net-benefit of farmers in subsidised price while, the net-benefit of farmers is not increased under the deficit irrigation of wheat crop with non-subsided water price and tomato crop in both price configurations. Sensitivity analysis of the model showed that annual tomato cropping costs and price are the most sensitive parameters in the optimisation.

Keywords: deficit irrigation ratios; off-stream reservoirs; nonlinear modelling; optimisation models; pricing configurations; subsidised water prices; non-subsided water prices; irrigation systems; wheat; tomatoes; cropping area ratio.

DOI: 10.1504/IJHST.2015.072636

International Journal of Hydrology Science and Technology, 2015 Vol.5 No.4, pp.372 - 385

Received: 22 Apr 2015
Accepted: 24 Jun 2015
Published online: 22 Oct 2015 *

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